Some of my thoughts on the recent WvW blog post as I look at things like supply, NPC allies, and server size:

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The supply mechanic also means that a determined server can bleed out a well-defended keep. If the supply trains stop coming to help fortifications, but supply is added to the attacking force to build more siege engines the keep will fall. It appears that skirmishes on secondary objectives will be critical while the siege continues. I like, at least on paper, this “soft” gating as compared to Warhammer Online‘s hard gating using minor objectives.